WO2008028658A1 - Échangeur thermique - Google Patents

Échangeur thermique Download PDF

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Publication number
WO2008028658A1
WO2008028658A1 PCT/EP2007/007782 EP2007007782W WO2008028658A1 WO 2008028658 A1 WO2008028658 A1 WO 2008028658A1 EP 2007007782 W EP2007007782 W EP 2007007782W WO 2008028658 A1 WO2008028658 A1 WO 2008028658A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat exchanger
exchanger according
passage
block
bypass
Prior art date
Application number
PCT/EP2007/007782
Other languages
German (de)
English (en)
Inventor
Florian Finck
Hubert Pomin
Klaus Hassdenteufel
Original Assignee
Behr Gmbh & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Behr Gmbh & Co. Kg filed Critical Behr Gmbh & Co. Kg
Priority to US12/439,851 priority Critical patent/US20100000717A1/en
Priority to EP07818062.7A priority patent/EP2064510B1/fr
Priority to JP2009527056A priority patent/JP2010502929A/ja
Publication of WO2008028658A1 publication Critical patent/WO2008028658A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05375—Assemblies of conduits connected to common headers, e.g. core type radiators with particular pattern of flow, e.g. change of flow direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/001—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0202—Header boxes having their inner space divided by partitions
    • F28F9/0204—Header boxes having their inner space divided by partitions for elongated header box, e.g. with transversal and longitudinal partitions
    • F28F9/0209—Header boxes having their inner space divided by partitions for elongated header box, e.g. with transversal and longitudinal partitions having only transversal partitions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/18—Arrangements or mounting of liquid-to-air heat-exchangers
    • F01P2003/187—Arrangements or mounting of liquid-to-air heat-exchangers arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/008—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for vehicles
    • F28D2021/0091—Radiators
    • F28D2021/0094—Radiators for recooling the engine coolant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/06—Derivation channels, e.g. bypass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/26—Safety or protection arrangements; Arrangements for preventing malfunction for allowing differential expansion between elements

Definitions

  • the invention relates to a heat exchanger according to the preamble of claim 1.
  • Such heat exchangers which have a heat exchanger block, called block for short, with parallel flow channels are known, for. B. as a coolant / air cooler in motor vehicles. Through the flow channels flows to be cooled medium, for. B. the coolant of a cooling circuit of an internal combustion engine of a motor vehicle.
  • the coolant is preferably cooled by air (ambient air), with secondary exchange surfaces in the form of ribs.
  • different flow patterns are known, e.g. B. downdraft cooler or cross-flow cooler with one or two flow threads. In the latter case, the flow through the block is U-shaped.
  • two manifolds are provided on the block, wherein the first has an inlet and an outlet chamber and the second is designed as a deflection box.
  • the deflection of the flow thus takes place "in the width", ie in the longitudinal direction of the deflection box
  • the division of the block into a first and a second passage is usually 50:50, so that the flow velocities in the tubes of both block halves are the same Flow direction of the cooling air is perpendicular to the flow direction of To be cooled medium - thus the heat transfer takes place in the cross flow.
  • the temperature of the medium in the tubes of the first passage is higher than the temperature of the medium in the second passage due to the cooling.
  • a heat exchanger for internal combustion engines trained heat exchanger has been known, rather consisting of a rib / tube block, an upper and a lower box and side panels, which are formed as flow channels and flows through the coolant.
  • the medium to be cooled is removed from the boxes and thus cools the side parts, which thereby obtain a lower component temperature. This avoids excessive temperature differences between cooling tubes and side panels and increased thermal stresses.
  • a bypass to be assigned to the first passage of the heat exchanger, that is to say for the first U-leg of the flow path, that is to say for the first passage.
  • H. a portion of the medium to be cooled is branched off before entering the first passage of the heat exchanger, passed through the bypass and uncooled after the first passage or before the second passage of the main flow fed again.
  • the block of the heat exchanger are advantageously associated with a first collection box with inlet and outlet chamber and a second collection box in the form of a deflection box.
  • the bypass channel extends in this case between inlet chamber and deflection box, wherein the local entry of the bypass channel into the deflection box can be made variable, ie depending on the desired temperature increase in the second passage.
  • the entry of the bypass channel into the deflection box can be at the level of a partition which separates the inlet and outlet chambers.
  • the heat exchanger preferably has horizontally extending flow channels and is vertically attached. arranged collecting boxes.
  • the deflection box has an inlet opening.
  • the bypass channel opens into the deflection box.
  • the bypass channel and / or the deflection box leads only slightly cooled medium.
  • the bypass channel is arranged in the deflection box. Slightly cooled medium enters the deflection box via an inlet opening. The closer the inlet opening of the bypass channel is placed to the inlet to the second passage, the less mixing takes place with the cooled medium of the first passage, and the more an increase in the temperature takes place in the second passage.
  • the division of the block into a first passage and a second passage can be made 1: 1, but also deviating. With the same distribution, essentially the same flow rates result in both passes.
  • the flow velocity in the bypass channel is higher and can be adjusted to the desired value by dimensioning its cross section or flow resistance. The higher the flow velocity in the bypass channel, the faster the temperature front of the hot medium reaches the deflection box or the entrance to the second passage. Thus, suddenly occurring temperature increases of the medium to be cooled and the associated increased temperature differences between the first and second passage can be compensated, since the temperature fronts run in the first and in the second passage against each other.
  • the bypass channel can advantageously be designed as a separate bypass line to the heat exchanger or integrated into the heat exchanger.
  • the latter can be done for example by integration of the bypass channel in a side part of the heat exchanger.
  • the side part as a flow channel, that is hollow and is in flow communication with the inlet box and the deflection box.
  • the heat exchanger is designed as a coolant / air cooler in the coolant circuit of an internal combustion engine for a motor vehicle.
  • the radiator block consists of tubes and ribs through which coolant can flow and which are acted upon by the ambient air.
  • the rib / tube block can be made mechanically or formed as a soldered block.
  • the collecting boxes can be made of plastic or metal, in particular aluminum, for example in the case of all-aluminum coolers.
  • the bypass line has a diameter in the range of 7 to 16 mm.
  • the proportion of throughput through the bypass in the total throughput through the radiator is thus between 10 and 25%.
  • FIG. 2 shows a coolant cooler according to the invention with bypass line
  • FIG. 3 shows a temperature / time diagram
  • Fig. 5 is a schematic representation of the temperature fronts in a cooler according to the invention
  • Fig. 6 is a schematic representation of an inlet pipe for introducing the coolant from the bypass line and
  • Fig. 7 is another view for schematically illustrating an inlet pipe for introducing the coolant from the bypass line.
  • Fig. 1 shows a designed as a coolant / air cooler heat exchanger 1 according to the prior art.
  • the coolant radiator 1, hereinafter referred to as radiator for short is arranged as a cross-flow radiator in a coolant circuit, not shown, for an internal combustion engine of a motor vehicle.
  • the radiator 1 has a radiator block 2, hereinafter referred to as block 2, on which not shown horizontally extending tubes (flow channels) and arranged on the outside of the tubes, also not shown ribs. Tubes and ribs are preferably in a block, that is soldered to the block 2.
  • other constructions come, for. As mechanically manufactured round or oval tube systems into consideration.
  • the block 2 is flowed through in the direction of an arrow A as a result of the partition wall 3a from the coolant, which enters through a inlet nozzle 3d in the inlet chamber 3b, first in a first, in the drawing above passage 2a (first pipe group).
  • the coolant is deflected in the deflection box 4, then flows back through a second, located in the drawing below passage 2b (second tube group) in the direction of arrow B, enters the outlet chamber 3c and exits through an outlet nozzle 3e the radiator 1.
  • a second located in the drawing below passage 2b (second tube group) in the direction of arrow B, enters the outlet chamber 3c and exits through an outlet nozzle 3e the radiator 1.
  • Die Both passages or pipe groups 2a, 2b are separated by a dashed line m at the level of the partition wall 3a.
  • the coolant flowing through the tubes is cooled by ambient air, which flows through the block 2 perpendicular to the plane of the drawing.
  • Fig. 2 shows a heat exchanger 5 according to the invention, which is also designed as a coolant / air cooler for a motor vehicle and the known radiator 1 according to the prior art corresponds - therefore the reference numbers of the radiator 1 of FIG. 1 are adopted for matching parts of the radiator 5 ,
  • the cooler 5 has - in contrast to the known cooler 1 - a bypass line 6, which bypasses the first passage 2a of the block 2, without causing the coolant is cooled.
  • the incoming coolant flow is indicated by an arrow VE, the exiting coolant flow by an arrow V A.
  • the bypass line 6 thus branches off before or in the inlet chamber 3b and is connected via an inlet opening 7 with the deflection box 4.
  • the bypass line 6 can be used as a separate line, z. B.
  • This can be achieved, for example, in a cooler with side parts, wherein a side part, which rests against the block half of the first passage, is hollow and designed as a flow channel and flows through the coolant from the inlet chamber to the deflecting boxes.
  • the inlet opening 7 is preferably arranged in a region b, which differs in each case by about 15% of the width of the block 2 to both sides of the line m.
  • the inlet opening or entry point 7 is to be understood as the point where the bypass flow (the coolant flow through the bypass channel 6) meets the coolant flow in the deflection box 4 and both flows mix.
  • the diameter of the bypass line for a radiator in a range of 7 - 16 mm mm - the proportion of bypass flow in the total throughput through the radiator 5 can thus be adjusted between 10% and 25%.
  • the inlet opening 7 in the deflection box 4 is in the drawing, d. H. in a preferred embodiment, located above the line m which separates the first passageway 2a located at the top from the second passage 2b located at the bottom of the drawing. Since the first passage 2a and the second passage 2b have the same number of tubes (not shown) having the same flow cross-sections, the upper and lower block halves 2a, 2b are the same. However, it is also within the scope of the invention, the flow cross-sections of the passages 2a, 2b differing from 50: 50, z. B. 40:60 interpreted.
  • Coolant in the central region of the deflection box 4 is the second
  • Passage 2b hot or relatively uncooled coolant supplied so that the temperature of the coolant increases in the second passage 2b.
  • FIG. 3 shows a diagram in which the inlet temperature T E of the coolant, that is to say the coolant stream V E , is plotted over the time t.
  • the illustrated temperature curve is based on the following two operating states in the vehicle: In the first operating state (short-circuit operation), the thermostat of the coolant circuit (not shown) is closed and the engine runs in the partial load range. The coolant cooler cools the coolant to near ambient temperature (T1). The volume flow in the cooler is zero or very low in this operating state. In the second operating state, the engine is running under load, therefore more heat is withdrawn. conditions, ie the thermostat opens. The volume flow increases and coolant flows into the cooler at a temperature T2 which is higher than T1.
  • T1 is the low coolant inlet temperature
  • T2 represents the increased coolant inlet temperature which, as mentioned above, may occur with an increase in engine load.
  • the polyline which represents the time dependence of the temperature TE on the time t, shows the delay with which a temperature increase from T1 to
  • T2 propagates to the radiator inlet to the deflection box.
  • t2-t1 a period of time (t4-t2) elapses until the temperature T2 also reaches the deflection box, i. H. arrived at the entrance to the second passage.
  • the entry point 7 is advantageously arranged in the range of ⁇ 15% of the cooling width relative to the position of the partition (line m). Due to the bypass flow and its entry in the area of the line m, coolant with the elevated temperature T2 is led directly to the inlet of the second passage 2b. As a result, a temperature distribution or a temperature front is formed, which is modeled (idealized) by a hatched area 8.
  • the region with increased coolant inlet temperature T2 in the first passage is also hatched and provided with the reference number 9.
  • the hatched areas 8, 9 form areas A u and A 0 , which correspond to the coolant volumes with the temperature T2.
  • the corresponding hatched area of the temperature T2 is designated A.
  • the relation A A 0 + A u .
  • the diagram shows that the temperature fronts of the area 9 (A 0 ) in the first pass and the area 8 (A u ) in the second pass run against each other, ie towards each other.
  • the time lag between the temperature increase in the box 3a and the box 4 at the point 7 can be varied and adjusted.
  • Figure 6 and Figure 7 show an embodiment of an inlet pipe 21.
  • the inlet pipe 21 is connected to the bypass channel 6 by means of a pipe flange 20 and serves to introduce the coolant from the bypass channel 6 in the deflection box 4.
  • the inlet pipe 21 protrudes at least partially in the Umlenklasten 4 into it.
  • the inlet pipe 21 is at least bent and / or has at least one opening 22 for introducing the coolant from the bypass channel 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

L'invention concerne un échangeur thermique (5) comprenant un bloc (2) qui comporte des canaux d'écoulement parallèles, ce bloc pouvant être traversé par une substance à refroidir circulant dans au moins deux passages (2a, 2b) dans des sens opposés. Selon l'invention, un canal de dérivation (6) pouvant être traversé par la substance à refroidir est associé au premier passage (2a).
PCT/EP2007/007782 2006-09-06 2007-09-06 Échangeur thermique WO2008028658A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US12/439,851 US20100000717A1 (en) 2006-09-06 2007-09-06 Heat exchanger
EP07818062.7A EP2064510B1 (fr) 2006-09-06 2007-09-06 Echangeur de chaleur a double flux avec canal de derivation integre
JP2009527056A JP2010502929A (ja) 2006-09-06 2007-09-06 熱交換器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006042239 2006-09-06
DE102006042239.2 2006-09-06

Publications (1)

Publication Number Publication Date
WO2008028658A1 true WO2008028658A1 (fr) 2008-03-13

Family

ID=38875039

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/007782 WO2008028658A1 (fr) 2006-09-06 2007-09-06 Échangeur thermique

Country Status (5)

Country Link
US (1) US20100000717A1 (fr)
EP (1) EP2064510B1 (fr)
JP (1) JP2010502929A (fr)
DE (1) DE102007042282A1 (fr)
WO (1) WO2008028658A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9658005B2 (en) * 2010-11-18 2017-05-23 Hamilton Sundstrand Corporation Heat exchanger system
CA2769913C (fr) * 2011-03-03 2013-09-24 Toru Hisanaga Dispositif de recuperation de la chaleur de gaz d'echappement
US10107565B2 (en) * 2013-04-05 2018-10-23 Hamilton Sundstrand Corporation Galley cooling
DE102016213801A1 (de) 2016-07-27 2018-02-01 Mahle International Gmbh Wärmeübertrager
US11525638B2 (en) 2020-10-19 2022-12-13 Dana Canada Corporation High-performance heat exchanger with calibrated bypass
WO2022123611A1 (fr) * 2020-12-07 2022-06-16 Thermokey S.P.A. Échangeur de chaleur
IT202000030107A1 (it) * 2020-12-07 2022-06-07 Thermokey S P A Scambiatore di calore

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1558009A (en) * 1919-10-20 1925-10-20 Fulton Co Cooling system for internal-combustion engines
US3450197A (en) * 1965-02-06 1969-06-17 Ferodo Sa Heat exchangers
DE19818004A1 (de) * 1997-04-23 1998-11-05 Denso Corp Wärmetauscher mit in mehrere Kernbereiche aufgeteiltem Wärmeaustauschzwecken dienenden Kernbereich
WO2006112540A1 (fr) * 2005-04-20 2006-10-26 Showa Denko K.K. Echangeur thermique

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0864840B1 (fr) * 1997-03-11 2001-09-26 Behr GmbH & Co. Echangeur de chaleur pour véhicule automobile
JP2005325699A (ja) * 2004-05-12 2005-11-24 Calsonic Kansei Corp ラジエータの冷却水バイパス構造

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1558009A (en) * 1919-10-20 1925-10-20 Fulton Co Cooling system for internal-combustion engines
US3450197A (en) * 1965-02-06 1969-06-17 Ferodo Sa Heat exchangers
DE19818004A1 (de) * 1997-04-23 1998-11-05 Denso Corp Wärmetauscher mit in mehrere Kernbereiche aufgeteiltem Wärmeaustauschzwecken dienenden Kernbereich
WO2006112540A1 (fr) * 2005-04-20 2006-10-26 Showa Denko K.K. Echangeur thermique

Also Published As

Publication number Publication date
EP2064510B1 (fr) 2016-04-06
DE102007042282A1 (de) 2008-03-27
US20100000717A1 (en) 2010-01-07
EP2064510A1 (fr) 2009-06-03
JP2010502929A (ja) 2010-01-28

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